In this Feb. 29, 2008 file photo the Aurora Borealis spins above ...
In this Feb. 29, 2008 file photo the Aurora Borealis spins above the Talkeetna Range and a hay field on Farm Loop Road near Palmer, Alaska, on Feb. 29, 2008. The center of the circular corona, usually near Earth's north pole sometimes fluctuates further south and can be seen from a lower latitude as in this instance.
(AP Photo/Bob Martinson, File)
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